Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce366f21093fdeb4…

MALICIOUS

PDF

43.7 KB Created: 2021-06-04 03:53:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d5699ef4e74c9f2e486fbeea15d0a4d4 SHA-1: 94ab3811023fa67e286d0d0a34f091ed9732d48e SHA-256: ce366f21093fdeb4bbb89bda0742bb236b0fb1ce43fb2b8bf9d1a86700daefb0
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users to external sites, including a known malicious redirector. The document body and embedded links promote 'free generators' and 'hacks' for popular games, indicating a phishing or scam attempt. The presence of numerous links to PDF files hosted on a link farm further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.online/app/406889139/free-coin-master-spin-and-coin-link-game-hack In PDF document text
    • http://lib3tell.stptrisakti.net/repository/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/coin-master-hack-account_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-hack-apk-android-1_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/how-to-make-a-group-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/earn-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/coin-master-free-spins-ios_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/how-to-get-more-followers-on-tiktok-free_GM835599320.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/clean-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/mcmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/roblox-www-com_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/the-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/are-there-any-coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004e9d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E9D 26072 bytes
SHA-256: 969ec04c2af38676ecdf58e28cd8ebf3d9c11c3a808c5b36beda9ddf547fe663
font_01_sfnt_off0000887a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x887A 18228 bytes
SHA-256: 033fb27de386422edfdfffc04f89508c7363de2f22c7244a0850c98a16a8d6aa

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